source: josm/trunk/src/com/kitfox/svg/Gradient.java@ 5601

Last change on this file since 5601 was 4256, checked in by bastiK, 14 years ago

see #6560 - basic svg support, includes kitfox svgsalamander, r 98, patched
File size: 9.0 KB
Line 
1/*
2 * Gradient.java
3 *
4 *
5 * The Salamander Project - 2D and 3D graphics libraries in Java
6 * Copyright (C) 2004 Mark McKay
7 *
8 * This library is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU Lesser General Public
10 * License as published by the Free Software Foundation; either
11 * version 2.1 of the License, or (at your option) any later version.
12 *
13 * This library is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * Lesser General Public License for more details.
17 *
18 * You should have received a copy of the GNU Lesser General Public
19 * License along with this library; if not, write to the Free Software
20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
21 *
22 * Mark McKay can be contacted at mark@kitfox.com. Salamander and other
23 * projects can be found at http://www.kitfox.com
24 *
25 * Created on January 26, 2004, 3:25 AM
26 */
27
28package com.kitfox.svg;
29
30import java.net.*;
31import java.util.*;
32import java.awt.geom.*;
33import java.awt.*;
34
35import com.kitfox.svg.xml.*;
36
37/**
38 * @author Mark McKay
39 * @author <a href="mailto:mark@kitfox.com">Mark McKay</a>
40 */
41abstract public class Gradient extends FillElement
42{
43
44 public static final int SM_PAD = 0;
45 public static final int SM_REPEAT = 1;
46 public static final int SM_REFLECT = 2;
47
48 int spreadMethod = SM_PAD;
49
50 public static final int GU_OBJECT_BOUNDING_BOX = 0;
51 public static final int GU_USER_SPACE_ON_USE = 1;
52
53 protected int gradientUnits = GU_OBJECT_BOUNDING_BOX;
54
55 //Either this gradient contains a list of stops, or it will take it's
56 // stops from the referenced gradient
57 ArrayList stops = new ArrayList();
58 URI stopRef = null;
59// Gradient stopRef = null;
60
61 protected AffineTransform gradientTransform = null;
62
63 //Cache arrays of stop values here
64 float[] stopFractions;
65 Color[] stopColors;
66
67 /** Creates a new instance of Gradient */
68 public Gradient() {
69 }
70
71 /**
72 * Called after the start element but before the end element to indicate
73 * each child tag that has been processed
74 */
75 public void loaderAddChild(SVGLoaderHelper helper, SVGElement child) throws SVGElementException
76 {
77 super.loaderAddChild(helper, child);
78
79 if (!(child instanceof Stop)) return;
80 appendStop((Stop)child);
81 }
82
83 protected void build() throws SVGException
84 {
85 super.build();
86
87 StyleAttribute sty = new StyleAttribute();
88 String strn;
89
90 if (getPres(sty.setName("spreadMethod")))
91 {
92 strn = sty.getStringValue().toLowerCase();
93 if (strn.equals("repeat")) spreadMethod = SM_REPEAT;
94 else if (strn.equals("reflect")) spreadMethod = SM_REFLECT;
95 else spreadMethod = SM_PAD;
96 }
97
98 if (getPres(sty.setName("gradientUnits")))
99 {
100 strn = sty.getStringValue().toLowerCase();
101 if (strn.equals("userspaceonuse")) gradientUnits = GU_USER_SPACE_ON_USE;
102 else gradientUnits = GU_OBJECT_BOUNDING_BOX;
103 }
104
105 if (getPres(sty.setName("gradientTransform"))) gradientTransform = parseTransform(sty.getStringValue());
106 //If we still don't have one, set it to identity
107 if (gradientTransform == null) gradientTransform = new AffineTransform();
108
109
110 //Check to see if we're using our own stops or referencing someone else's
111 if (getPres(sty.setName("xlink:href")))
112 {
113 try {
114 stopRef = sty.getURIValue(getXMLBase());
115//System.err.println("Gradient: " + sty.getStringValue() + ", " + getXMLBase() + ", " + src);
116// URI src = getXMLBase().resolve(href);
117// stopRef = (Gradient)diagram.getUniverse().getElement(src);
118 }
119 catch (Exception e)
120 {
121 throw new SVGException("Could not resolve relative URL in Gradient: " + sty.getStringValue() + ", " + getXMLBase(), e);
122 }
123 }
124 }
125
126 public float[] getStopFractions()
127 {
128 if (stopRef != null)
129 {
130 Gradient grad = (Gradient)diagram.getUniverse().getElement(stopRef);
131 return grad.getStopFractions();
132 }
133
134 if (stopFractions != null) return stopFractions;
135
136 stopFractions = new float[stops.size()];
137 int idx = 0;
138 for (Iterator it = stops.iterator(); it.hasNext();)
139 {
140 Stop stop = (Stop)it.next();
141 float val = stop.offset;
142 if (idx != 0 && val < stopFractions[idx - 1]) val = stopFractions[idx - 1];
143 stopFractions[idx++] = val;
144 }
145
146 return stopFractions;
147 }
148
149 public Color[] getStopColors()
150 {
151 if (stopRef != null)
152 {
153 Gradient grad = (Gradient)diagram.getUniverse().getElement(stopRef);
154 return grad.getStopColors();
155 }
156
157 if (stopColors != null) return stopColors;
158
159 stopColors = new Color[stops.size()];
160 int idx = 0;
161 for (Iterator it = stops.iterator(); it.hasNext();)
162 {
163 Stop stop = (Stop)it.next();
164 int stopColorVal = stop.color.getRGB();
165 Color stopColor = new Color((stopColorVal >> 16) & 0xff, (stopColorVal >> 8) & 0xff, stopColorVal & 0xff, clamp((int)(stop.opacity * 255), 0, 255));
166 stopColors[idx++] = stopColor;
167 }
168
169 return stopColors;
170 }
171
172 public void setStops(Color[] colors, float[] fractions)
173 {
174 if (colors.length != fractions.length)
175 {
176 throw new IllegalArgumentException();
177 }
178
179 this.stopColors = colors;
180 this.stopFractions = fractions;
181 stopRef = null;
182 }
183
184 private int clamp(int val, int min, int max)
185 {
186 if (val < min) return min;
187 if (val > max) return max;
188 return val;
189 }
190
191 public void setStopRef(URI grad)
192 {
193 stopRef = grad;
194 }
195
196 public void appendStop(Stop stop)
197 {
198 stops.add(stop);
199 }
200
201 /**
202 * Updates all attributes in this diagram associated with a time event.
203 * Ie, all attributes with track information.
204 * @return - true if this node has changed state as a result of the time
205 * update
206 */
207 public boolean updateTime(double curTime) throws SVGException
208 {
209// if (trackManager.getNumTracks() == 0) return false;
210 boolean stateChange = false;
211
212 //Get current values for parameters
213 StyleAttribute sty = new StyleAttribute();
214 boolean shapeChange = false;
215 String strn;
216
217
218 if (getPres(sty.setName("spreadMethod")))
219 {
220 int newVal;
221 strn = sty.getStringValue().toLowerCase();
222 if (strn.equals("repeat")) newVal = SM_REPEAT;
223 else if (strn.equals("reflect")) newVal = SM_REFLECT;
224 else newVal = SM_PAD;
225 if (spreadMethod != newVal)
226 {
227 spreadMethod = newVal;
228 stateChange = true;
229 }
230 }
231
232 if (getPres(sty.setName("gradientUnits")))
233 {
234 int newVal;
235 strn = sty.getStringValue().toLowerCase();
236 if (strn.equals("userspaceonuse")) newVal = GU_USER_SPACE_ON_USE;
237 else newVal = GU_OBJECT_BOUNDING_BOX;
238 if (newVal != gradientUnits)
239 {
240 gradientUnits = newVal;
241 stateChange = true;
242 }
243 }
244
245 if (getPres(sty.setName("gradientTransform")))
246 {
247 AffineTransform newVal = parseTransform(sty.getStringValue());
248 if (newVal != null && newVal.equals(gradientTransform))
249 {
250 gradientTransform = newVal;
251 stateChange = true;
252 }
253 }
254
255
256 //Check to see if we're using our own stops or referencing someone else's
257 if (getPres(sty.setName("xlink:href")))
258 {
259 try {
260 URI newVal = sty.getURIValue(getXMLBase());
261 if ((newVal == null && stopRef != null) || !newVal.equals(stopRef))
262 {
263 stopRef = newVal;
264 stateChange = true;
265 }
266 }
267 catch (Exception e)
268 {
269 e.printStackTrace();
270 }
271 }
272
273 //Check stops, if any
274 for (Iterator it = stops.iterator(); it.hasNext();)
275 {
276 Stop stop = (Stop)it.next();
277 if (stop.updateTime(curTime))
278 {
279 stateChange = true;
280 stopFractions = null;
281 stopColors = null;
282 }
283 }
284
285 return stateChange;
286 }
287
288}
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